Officials say undercover detectives and confidential sources bought small amounts of heroin, cocaine and marijuana from the Berks County drug dealers. The undercover purchases ranged from $30 to $170 worth of drugs, according to investigators.

Police say they arrested seven suspected drug dealers and five other suspects on Monday as a result of the investigation. Of the 12 suspects, five of them are teenagers, including two students at Brandywine Heights Area High School.

During a press conference, officials stated that the students were arrested at the school. They also claimed that one of the students, an unidentified 17-year-old girl, had heroin in her possession at the time of her arrest.

The following people were charged with delivery of heroin, cocaine and marijuana, tampering with or fabricating physical evidence, and other related charges: